<!doctype html>
<html lang="en">
  <head>
    <title>Title</title>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
  </head>
  <style>
    .featurette-divider {
        margin: 5rem 0;
    }
    .line {
        color: rgb(0, 0, 255);
        text-decoration: underline;
    }
    .bd-placeholder-img {
        font-size: 1.125rem;
        text-anchor: middle;
        -webkit-user-select: none;
        -moz-user-select: none;
        user-select: none;
    }
    .text-muted {
        --bs-text-opacity: 1;
        color: #6c757d!important;
    }

    .featurette-heading {
        margin-top: 7rem;
        font-size: 50px;
        letter-spacing: -.05rem;
    }
    .lh-1 {
        line-height: 1!important;
    }
    .fw-normal {
        font-weight: 400!important;
    }
    .carousel-bottom{
        margin-bottom: 64px;
    }
  </style>
  <body class="py-5">
    <header>
        <nav class="navbar navbar-expand-sm navbar-dark fixed-top bg-dark ">
            <a class="navbar-brand" href="#">轮播</a>
            <button class="navbar-toggler d-lg-none" type="button" data-toggle="collapse" data-target="#collapsibleNavId" aria-controls="collapsibleNavId"
                aria-expanded="false" aria-label="Toggle navigation"></button>
            <div class="collapse navbar-collapse" id="collapsibleNavId">
                <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
                    <li class="nav-item active">
                        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Link</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link disabled">Disabled</a>
                    </li>
                </ul>
                <form class="form-inline my-2 my-lg-0">
                    <input class="form-control mr-sm-2" type="text" placeholder="Search">
                    <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
                </form>
            </div>
        </nav>
    </header>
    <main role="main">
        <div id="carouselId" class="carousel slide carousel-bottom" data-ride="carousel">
            <ol class="carousel-indicators">
                <li data-target="#carouselId" data-slide-to="0" class="active"></li>
                <li data-target="#carouselId" data-slide-to="1"></li>
                <li data-target="#carouselId" data-slide-to="2"></li>
            </ol>
            <div class="carousel-inner" role="listbox">
                <div class="carousel-item active">
                    <svg class="bd-placeholder-img" width="100%" height="512px" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" preserveAspectRatio="xMidYMid slice" focusable="false">
                        <rect width="100%" height="100%" fill="#777"></rect>
                    </svg>
                    <div class="container">
                        <div class="carousel-caption text-left">
                          <h1>Example headline.</h1>
                          <p>Some representative placeholder content for the first slide of the carousel.</p>
                          <p><a class="btn btn-lg btn-primary " href="#">Sign up today</a></p>
                        </div>
                    </div>
                </div>
                <div class="carousel-item ">
                    <svg class="bd-placeholder-img" width="100%" height="512px" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" preserveAspectRatio="xMidYMid slice" focusable="false">
                        <rect width="100%" height="100%" fill="#777"></rect>
                    </svg>
                    <div class="container">
                        <div class="carousel-caption text-center">
                          <h1>Another example headline.</h1>
                          <p>Some representative placeholder content for the second slide of the carousel.</p>
                          <p><a class="btn btn-lg btn-primary " href="#">leran more</a></p>
                        </div>
                    </div>
                </div>
                <div class="carousel-item ">
                    <svg class="bd-placeholder-img" width="100%" height="512px" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" preserveAspectRatio="xMidYMid slice" focusable="false">
                        <rect width="100%" height="100%" fill="#777"></rect>
                    </svg>
                    <div class="container">
                        <div class="carousel-caption text-right">
                          <h1>One more for good measure.</h1>
                          <p>Some representative placeholder content for the first slide of the carousel.</p>
                          <p><a class="btn btn-lg btn-primary " href="#">Browse gallery</a></p>
                        </div>
                    </div>
                </div>
            </div>
            <a class="carousel-control-prev" href="#carouselId" role="button" data-slide="prev">
                <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                <span class="sr-only">Previous</span>
            </a>
            <a class="carousel-control-next" href="#carouselId" role="button" data-slide="next">
                <span class="carousel-control-next-icon" aria-hidden="true"></span>
                <span class="sr-only">Next</span>
            </a>
        </div>
        <div class="container">
            <div class="row">
                <div class="col-lg-4 text-center">
                  <svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 140x140" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"></rect><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
                  <h2>Heading</h2>
                  <p>Some representative placeholder content for the three columns of text below the carousel. This is the first column.</p>
                  <p><a class="btn btn-secondary" href="#">View details »</a></p>
                </div>
                <div class="col-lg-4 text-center">
                  <svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 140x140" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"></rect><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
                  <h2>Heading</h2>
                  <p>Another exciting bit of representative placeholder content. This time, we've moved on to the second column.</p>
                  <p><a class="btn btn-secondary" href="#">View details »</a></p>
                </div>
                <div class="col-lg-4 text-center">
                  <svg class="bd-placeholder-img rounded-circle" width="140" height="140" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 140x140" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#777"></rect><text x="50%" y="50%" fill="#777" dy=".3em">140x140</text></svg>
                  <h2>Heading</h2>
                  <p>And lastly this, the third column of representative placeholder content.</p>
                  <p><a class="btn btn-secondary" href="#">View details »</a></p>
                </div>
            </div>
            <hr class="featurette-divider">
            <div class="row featurette">
                <div class="col-md-7">
                    <h2 class="featurette-heading fw-normal lh-1">First featurette heading. 
                        <span class="text-muted">It’ll blow your mind.</span>
                    </h2>
                    <p class="lead">Some great placeholder content for the first featurette here. Imagine some exciting prose here.</p>
                </div>
                <div class="col-md-5">
                  <svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 500x500" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Placeholder</title><rect width="100%" height="100%" fill="#eee"></rect><text x="50%" y="50%" fill="#aaa" dy=".3em">500x500</text></svg>
                </div>
              </div>
            <hr class="featurette-divider">
            <div class="row featurette">
                <div class="col-md-7 order-md-2">
                    <h2 class="featurette-heading fw-normal lh-1">Oh yeah, it’s that good. 
                        <span class="text-muted">See for yourself.</span>
                    </h2>
                  <p class="lead">Another featurette? Of course. More placeholder content here to give you an idea of how this layout would work with some actual real-world content in place.</p>
                </div>
                <div class="col-md-5 order-md-1">
                    <svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 500x500" preserveAspectRatio="xMidYMid slice" focusable="false">
                        <title>Placeholder</title>
                        <rect width="100%" height="100%" fill="#eee">
                        </rect>
                        <text x="50%" y="50%" fill="#aaa" dy=".3em">500x500</text>
                    </svg>
                </div>
              </div>
            <hr class="featurette-divider">
            <div class="row featurette">
                <div class="col-md-7">
                    <h2 class="featurette-heading fw-normal lh-1">And lastly, this one.
                        <span class="text-muted">Checkmate.</span>
                    </h2>
                    <p class="lead">And yes, this is the last block of representative placeholder content. Again, not really intended to be actually read, simply here to give you a better view of what this would look like with some actual content. Your content.</p>
                </div>
                <div class="col-md-5">
                    <svg class="bd-placeholder-img bd-placeholder-img-lg featurette-image img-fluid mx-auto" width="500" height="500" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder: 500x500" preserveAspectRatio="xMidYMid slice" focusable="false">
                        <title>Placeholder</title>
                        <rect width="100%" height="100%" fill="#eee">
                        </rect>
                        <text x="50%" y="50%" fill="#aaa" dy=".3em">
                            500x500
                        </text>
                    </svg>
                </div>
              </div>
        </div>
        <hr class="featurette-divider">
        <footer class="container">
            <p class="float-right line"><a href="#">Back to top</a></p>
            <p>© 2017-2022 Company, Inc. · <a class = "line"href="#">Privacy</a> · <a class = "line" href="#">Terms</a></p>
        </footer>
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  </body>
</html>